Carrier sense adaptive transmission (CSAT) in unlicensed spectrum

Abstract

Systems and methods for Carrier Sense Adaptive Transmission (CSAT) and related operations in unlicensed spectrum are disclosed to reduce interference between co-existing Radio Access Technologies (RATs). The parameters for a given CSAT communication scheme may be adapted dynamically based on received signals from a transceiver for a native RAT to be protected and an identification of how that RAT is utilizing a shared resource such as an unlicensed band. Other operations such as Discontinuous Reception (DRX) may be aligned with a CSAT Time Division Multiplexed (TDM) communication pattern by way of a DRX broadcast / multicast message. Different TDM communication patterns may be staggered in time across different frequencies. Channel selection for a co-existing RAT may also be configured to afford further protection to native RATs by preferring operation on secondary channels as opposed to primary channels.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application for patent claims the benefit of U.S. Provisional Application No. 61 / 881,837, entitled “ADAPTING COMMUNICATION BASED ON RESOURCE UTILIZATION,” filed Sep. 24, 2013, and U.S. Provisional Application No. 61 / 920,272, entitled “ADAPTING COMMUNICATION BASED ON RESOURCE UTILIZATION,” filed Dec. 23, 2013, both assigned to the assignee hereof, and expressly incorporated herein by reference in their entirety.REFERENCE TO CO-PENDING APPLICATIONS FOR PATENT[0002]The present application for patent is also related to the following co-pending U.S. patent application: “CARRIER SENSE ADAPTIVE TRANSMISSION (CSAT) IN UNLICENSED SPECTRUM,” having Attorney Docket No. QC135183U2, filed concurrently herewith, assigned to the assignee hereof, and expressly incorporated herein by reference in its entirety.INTRODUCTION[0003]Aspects of this disclosure relate generally to telecommunications, and more particularly to co-existence between wirel...

AI Technical Summary

Benefits of technology

The patent text discusses the deployment of small cell base stations to improve indoor or specific geographic coverage. These small cell base stations provide additional capacity and a better user experience. The technical effect is better coverage and capacity for small cells and buildings.

Problems solved by technology

Even such careful planning, however, cannot fully accommodate channel characteristics such as fading, multipath, shadowing, etc., especially in indoor environments.

Indoor users therefore often face coverage issues (e.g., call outages and quality degradation) resulting in poor user experience.

However, it may also encroach on the operations of other RATs that typically utilize the same unlicensed bands, most notably IEEE 802.11x WLAN technologies generally referred to as “Wi-Fi.”

Images